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Proceedings Paper

Beyond the limits of present active matrix flat-panel imagers (AMFPIs) for diagnostic radiology
Author(s): Larry E. Antonuk; Youcef El-Mohri; Kyung-Wook Jee; Manat Maolinbay; Samer C. Nassif; Xiujiang Rong; Jeffrey H. Siewerdsen; Qihua Zhao; Robert A. Street
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Paper Abstract

A theoretical cascaded systems analysis of the performance limits of x-ray imagers based on thin-film, active matrix flat-panel technology is presented. This analysis specifically focuses upon an examination of the functional dependence of the detective quantum efficiency on exposure. While the DQE of AMFPI systems is relatively high at the large exposure levels associated with radiographic x-ray imaging, there is a significant decline in DQE with decreasing exposure over the medium and lower end of the exposure range associated with fluoroscopic imaging. This fall-off in DQE originates from the relatively large size of the additive noise of AMFPI systems compared to their overall system gain. Therefore, strategies to diminish additive noise and increase system gain should significantly improve performance. Potential strategies for noise reduction include the use of charge compensation lines while strategies for gain enhancement include continuous photodiodes, pixel amplification structures, or higher gain converters. The effect of the implementation of such strategies is examined for a variety for hypothetical imager configurations. Through the modeling of these configurations, such enhancements are shown to hold the potential of making low frequency DQE response large and essentially independent of exposure while greatly reducing the fall-off in DQE at higher spatial frequencies.

Paper Details

Date Published: 28 May 1999
PDF: 10 pages
Proc. SPIE 3659, Medical Imaging 1999: Physics of Medical Imaging, (28 May 1999); doi: 10.1117/12.349530
Show Author Affiliations
Larry E. Antonuk, Univ. of Michigan Medical Ctr. (United States)
Youcef El-Mohri, Univ. of Michigan Medical Ctr. (United States)
Kyung-Wook Jee, Univ. of Michigan Medical Ctr. (United States)
Manat Maolinbay, Univ. of Michigan Medical Ctr. (United States)
Samer C. Nassif, Univ. of Michigan Medical Ctr. (United States)
Xiujiang Rong, Univ. of Michigan Medical Ctr. (United States)
Jeffrey H. Siewerdsen, Univ. of Michigan Medical Ctr. and William Beaumont Hospital (Canada)
Qihua Zhao, Univ. of Michigan Medical Ctr. (United States)
Robert A. Street, Xerox Palo Alto Research Ctr. (United States)

Published in SPIE Proceedings Vol. 3659:
Medical Imaging 1999: Physics of Medical Imaging
John M. Boone; James T. Dobbins III, Editor(s)

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